How to distinguish between flat and oblique in ancient poems

Ping means flat and straight, and oblique means curved. According to the rhyme books revised during the Sui to Song dynasties, such as Cheyun and Guangyun, there were five tones in Middle Chinese, called Ping (yinping, yangping), Shang, Go, and 入(入). Except for Ping, the other three tones have variations of high and low, so they are collectively called oblique tones. The use of flat and oblique tones in poetry has a certain format called meter.

Ping and oblique tones, on behalf of the rhyme scheme of the poems composed of the flat and the oblique tones. Ping and oblique are attempts to dualize the four tones. The four tones are the four tones of the ancient Chinese language. The so-called tones refer to the height, elevation, and length of speech. Ping and oblique are summarized by incomplete induction on the basis of the four tones, with flat referring to flatness and straightness, and oblique referring to curvature and zigzagging.

In Chinese, Ping and oblique refer to the speed of speech. The rhyme a is a when read aloud and a when read in a low voice, and the a sound is louder than the o sound at about the same decibel level. This is because the opening of a is bigger. Therefore, it is not true that the a sound is heavier than the o sound.

There is a controversy between the flat and the narrow and the unconstrained flat and the narrow because there is no practical understanding of the flat and the narrow triggered by academics. In terms of mathematical principles, the flatness is based on incomplete induction. Standing on the physics point of view, we can through the song, better understand the flat and oblique.

Baidu Encyclopedia - Ping and Oblique